linux-kernel - Re: [PATCH] scripts/Makefile.build: fix ext mod subdirs build with separate src,build dirs

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Message-ID: <CAK7LNAQ3VJN5Ga1aJnrpaPoPaKMCZR3dauo-SWaH9=y9zv1F5w@mail.gmail.com>
Date: Mon, 15 Apr 2024 19:32:27 +0900
From: Masahiro Yamada <masahiroy@...nel.org>
To: Valerii Chernous <vchernou@...co.com>
Cc: Nathan Chancellor <nathan@...nel.org>, Nicolas Schier <nicolas@...sle.eu>, xe-linux-external@...co.com, 
	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scripts/Makefile.build: fix ext mod subdirs build with
 separate src,build dirs

On Mon, Apr 15, 2024 at 7:14 PM Valerii Chernous <vchernou@...co.com> wrote:
>
> The change allow to build external modules with nested makefiles.
> Current unofficial way(using "src" variable) allow to build
> external(out of tree) kernel module with separating source and build
> artifacts dirs but with nested makefiles it doesn't work properly.
> Build system trap to recursion inside makefiles, articafts output dir
> path grow with each iteration until exceed max path len and build failed
> This fix update "src" var during processing subdirs and resolve
> recursion issue
> Usage example:
> make -C KERNEL_SOURCE_TREE M=BUILD_OUT_DIR src=EXT_MOD_SRC_DIR modules
>
> Cc: Valerii Chernous <vchernou@...co.com>
> Cc: xe-linux-external@...co.com
> Signed-off-by: Valerii Chernous <vchernou@...co.com>


NACK.

Please do not send hacks over again.










> ---
>  scripts/Makefile.build | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/scripts/Makefile.build b/scripts/Makefile.build
> index a293950e2e07..75ea9052ea4a 100644
> --- a/scripts/Makefile.build
> +++ b/scripts/Makefile.build
> @@ -490,6 +490,7 @@ $(single-subdir-goals): $(single-subdirs)
>  PHONY += $(subdir-ym)
>  $(subdir-ym):
>         $(Q)$(MAKE) $(build)=$@ \
> +       $(if $(findstring command line,$(origin src)),src=$(patsubst $(obj)/%,$(src)/%,$@)) \
>         need-builtin=$(if $(filter $@...ilt-in.a, $(subdir-builtin)),1) \
>         need-modorder=$(if $(filter $@...dules.order, $(subdir-modorder)),1) \
>         $(filter $@/%, $(single-subdir-goals))
> --
> 2.35.6
>


-- 
Best Regards
Masahiro Yamada